How many ways can three items be selected from a group of six items?

20 times, 6C3 = (6*5*4)/(1*2*3) = 5*4 = 20

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since the cosine is the ratio of the adjacent side to the hypotenuse, you can see that cos 60° = ½. answer. according to the property of cofunctions (topic 3), sin 30° is equal to cos 60°. sin 30° = ½.